The job of the transmitter is to take the weak
analog measured parameter information from sensor,
be close to it, amplify, clean, linearize the
signal if required and send strong - error free
data over a long distance to an operator or
Analog Mux for Data Acquisition
Now with new Technologies like Zigbee and Modbus,
We can classify Transmitters as shown below. The
Measured Parameter Temperature, Flow or Events Has
to reach an Intelligent Data Storage and Analysis
System. It may just be an Human Operator who jots
the data on a Notepad and Turns a Few Dials based
on his Experience or an embedded controller. It
could even be a Computer Network or a Web
Application used by many, like Monitoring the
of Current Loop 4 to 20 mA Standard
You have a three wire RTD, there is also a 4 wire
RTD type, This circuit can be used for both.
In the 3W RTD you have two wires coming from the
same point (zero ohms between them) the third wire
will be 100 ohms from these two. From the two
wires that are at same point take one wire and
give 1mA from Q3 + OUT. The other wire of the pair
connect to input +..... input - can be connected
to the 100E end.
- Analog Transmitters - Like 4-20mA Loop.
- Electrically Isolated Analog Transmitters.
- Transmitters that need to be Intrinsically
- Digital Transmitters and Optical Interface.
- Wireless Transmitters and TCP-IP.
RTD 3-W Mains Powered Temperature 4-20mA